EP0372208A1 - Process for treating coal tar - Google Patents

Process for treating coal tar Download PDF

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Publication number
EP0372208A1
EP0372208A1 EP89119677A EP89119677A EP0372208A1 EP 0372208 A1 EP0372208 A1 EP 0372208A1 EP 89119677 A EP89119677 A EP 89119677A EP 89119677 A EP89119677 A EP 89119677A EP 0372208 A1 EP0372208 A1 EP 0372208A1
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EP
European Patent Office
Prior art keywords
tar
pitch
degrees
boiling
raw
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89119677A
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German (de)
French (fr)
Other versions
EP0372208B1 (en
Inventor
Wilhelm Dr. Stewen
Hans-Jürgen Hasse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RAG AG
Original Assignee
Ruhrkohle AG
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Publication of EP0372208A1 publication Critical patent/EP0372208A1/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
    • C10C1/00—Working-up tar
    • C10C1/04—Working-up tar by distillation
    • C10C1/06—Removal of water

Definitions

  • the invention relates to a method for processing the raw tar obtained when coking coal in two fractions, one of which contains components boiling up to 360 degrees Celsius and the other of the pitch fraction.
  • the invention has for its object to simplify the workup and make it more cost-effective.
  • the invention is based on the idea of initially dividing the raw tar into two fractions in a manner known per se. This could be e.g. with a fractional raw gas condensation.
  • operating problems are to be expected due to the pitch's tendency to cake, particularly in connection with solids.
  • a very advantageous work-up in two fractions is achieved in that the raw tar is first dewatered and then the water-free tar is separated into the fraction boiling up to 360 degrees Celsius and pitch.
  • the high-boiling part of the mechanic can be used to coke coal to be mixed. This improves the coking properties and is particularly economical.
  • the tar drawn from the tar separators with water contents of about 4-5% by weight is first preheated to about 155 degrees C in heat exchangers (1) and (2) and into the dewatering column (3) guided. Dewatered tar is obtained as the bottom product and is fed to further heat exchangers.
  • the water / light oil mixture is drawn off at the top of the column, cooled in condensers (4) and separated from one another in separators (5). A part of the light oil can be returned to the top of the column as reflux, the rest is obtained as a product and, for example, added to the tar that has been removed.
  • the tar drawn off as the bottom product of the dewatering column is preheated against tar vapors and pitch in further heat exchangers (6) and (7) and finally heated from approx. 320 ° C. to approx. 365 ° C.
  • the tar is divided into its pitch fraction and the lower-boiling components in the pitch column (9) operated at approx. 0.5 bar by vacuum flash evaporation without reflux.
  • the pitch's solidification point can e.g. can be adjusted by slight changes in the vacuum.
  • a vacuum pump is used to adjust the pressure.
  • the process has minimal energy requirements.
  • the minimum energy requirement is possible in particular with the selected pressure and temperature levels and the interconnection.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Coke Industry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

According to the invention, the crude tar produced in a coke works is no longer fed to a central treatment plant but is, in the coke works, initially treated to remove water and then separated into the fractions boiling up to 360 degrees C and pitch.

Description

Die Erfindung betrifft ein Verfahren zur Aufbereitung des beim Verkoken von Kohle anfallenden Rohteers in zwei Fraktionen, von denen die eine Komponenten bis 360 Grad Celsius siedend enthält und die andere die Pechfraktion.The invention relates to a method for processing the raw tar obtained when coking coal in two fractions, one of which contains components boiling up to 360 degrees Celsius and the other of the pitch fraction.

In der Bundesrepublik Deutschland bestehen eine Vielzahl von Kokereien. Der in diesen Kokereien anfallende Rohteer wird überwiegend einer zentralen Aufbereitungsanlage zugeführt. Dadurch entsteht erheblicher Frachtaufwand. Ferner sind für die Auf­arbeitung von Rohteer bisher erhebliche Mengen an Energie erforderlich. Der Erfindung liegt die Aufgabe zugrunde, die Aufarbeitung zu vereinfachen und kosten­günstiger zu gestalten. Dabei geht die Erfindung von der Überlegung aus, den Rohteer in an sich bekannter Weise zunächst in zwei Fraktionen zu teilen. Zwar ließe sich das z.B. durch eine fraktionierte Roh­gaskondensation bewerkstelligen. Dabei sind jedoch aufgrund der Neigung des Peches zur Anbackung, inbe­sondere in Verbindung mit Feststoffen, Betriebspro­bleme zu erwarten. Andere Verfahren zur Gewinnung von pecharmen oder pechfreien Teerfraktionen durch einen separierten Abzug an bestimmten Betriebspunkten erscheinen ebenfalls nicht zielführend, da auch der bei niedrigem Temperaturniveau anfallende Teer relativ hohe Pechanteile aufweist. Der Teer fällt z.B. im Vorkühler oder Elektrofilter an.There are a large number of coking plants in the Federal Republic of Germany. The raw tar produced in these coking plants is mainly fed to a central processing plant. This creates considerable freight costs. Furthermore, considerable amounts of energy have hitherto been required for processing raw tar. The invention has for its object to simplify the workup and make it more cost-effective. The invention is based on the idea of initially dividing the raw tar into two fractions in a manner known per se. This could be e.g. with a fractional raw gas condensation. However, operating problems are to be expected due to the pitch's tendency to cake, particularly in connection with solids. Other methods of obtaining low-pitch or low-pitch tar fractions by means of a separate discharge at certain operating points also do not appear to be expedient, since the tar obtained at a low temperature level also has a relatively high proportion of pitch. The tar falls e.g. in the precooler or electrostatic precipitator.

Nach der Erfindung wird eine sehr vorteilhafte Auf­arbeitung in zwei Fraktionen dadurch erreicht, daß der Rohteer zunächst entwässert und anschließend der wasserfreie Teer in die Fraktion bis 360 Grad Celsius, siedend, und Pech getrennt wird. Der hochsiedende Pechanteil kann der Einsatzkohle beim Verkoken zuge­ mischt werden. Das bewirkt eine Verbesserung der Ver­kokungseigenschaften und ist in besonderer Weise wirtschaftlich.According to the invention, a very advantageous work-up in two fractions is achieved in that the raw tar is first dewatered and then the water-free tar is separated into the fraction boiling up to 360 degrees Celsius and pitch. The high-boiling part of the mechanic can be used to coke coal to be mixed. This improves the coking properties and is particularly economical.

Weitere wirtschaftliche Vorteile können durch einen Verbund der Entwässerungskolonne bzw. Pechkolonne erreicht werden, indem das Kopfprodukt und/oder Sumpfprodukt aus der Pechkolonne zur Vorwärmung des Rohteers und/oder des Sumpfproduktes aus der Ent­wässerungskolonne verwendet wird.Further economic advantages can be achieved by combining the dewatering column or pitch column by using the top product and / or bottom product from the pitch column for preheating the raw tar and / or the bottom product from the dewatering column.

Im übrigen eröffnet obige Verfahrensweise die Mög­lichkeit zur wirtschaftlichen Aufarbeitung des Roh­teers auf derjenigen Kokerei, wo der Rohteer jeweils anfällt. Damit entfallen die Frachtkosten zu einer zentralen Aufarbeitungsstelle.Otherwise, the above procedure opens up the possibility of economical processing of the raw tar at the coking plant where the raw tar is produced. This eliminates the freight costs to a central processing point.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt.In the drawing, an embodiment of the invention is shown.

Wie in der nachfolgenden Abb. 1 schematisch darge­stellt, wird der aus den Teerscheidern abgezogene Teer mit Wassergehalten von etwa 4 - 5 Gew. % zunächst in Wärmetauschern (1) und (2) auf etwa 155 Grad C vorge­wärmt und in die Entwässerungskolonne (3) geführt. Als Sumpfprodukt fällt entwässerter Teer an, der weiteren Wärmetauschern zugeleitet wird.As shown schematically in Fig. 1 below, the tar drawn from the tar separators with water contents of about 4-5% by weight is first preheated to about 155 degrees C in heat exchangers (1) and (2) and into the dewatering column (3) guided. Dewatered tar is obtained as the bottom product and is fed to further heat exchangers.

Am Kopf der Kolonne wird das Wasser -/ Leichtölgemisch abgezogen, in Kondensatoren (4) gekühlt und in Scheidern (5) voneinander getrennt. Eine Teilmenge Leichtöl kann als Reflux auf den Kolonnenkopf zurückgegeben werden, der Rest wird als Produkt gewonnen und z.B. dem entpechten Teer zugemischt.The water / light oil mixture is drawn off at the top of the column, cooled in condensers (4) and separated from one another in separators (5). A part of the light oil can be returned to the top of the column as reflux, the rest is obtained as a product and, for example, added to the tar that has been removed.

Der als Sumpfprodukt der Entwässerungskolonne abge­zogene Teer wird in weiteren Wärmetauschern (6) und (7) gegen Teerdämpfe und Pech vorgewärmt und ab­schließend von ca. 320 Grad C auf ca. 365 Grad C erhitzt.The tar drawn off as the bottom product of the dewatering column is preheated against tar vapors and pitch in further heat exchangers (6) and (7) and finally heated from approx. 320 ° C. to approx. 365 ° C.

Durch die integrierte Wärmeverbundschaltung ist nur für diese Temperaturerhöhung von etwa 45 Grad C Fremdwärme, z.B. in einem Reboilerofen (8) zuzu­führen.Due to the integrated heat composite circuit, external heat is only required for this temperature increase of around 45 degrees C, e.g. feed in a reboiler furnace (8).

Die Aufteilung des Teeres in seine Pechfraktion und die leichter siedenden Komponenten erfolgt in der bei ca. 0,5 bar betriebenen Pechkolonne (9) durch Vakuum-­Flashverdampfung ohne Rückfluß. Der Erstarrungspunkt des Peches kann z.B. durch geringe Änderungen des Vakuums eingestellt werden. Zur Einstellung des Druckes dient eine Vakuumpumpe.The tar is divided into its pitch fraction and the lower-boiling components in the pitch column (9) operated at approx. 0.5 bar by vacuum flash evaporation without reflux. The pitch's solidification point can e.g. can be adjusted by slight changes in the vacuum. A vacuum pump is used to adjust the pressure.

Am Beispiel einer Kokerei mit einem Kohleeinsatz von 7800 t naß/d ergibt sich nachfolgende Mengenbilanz: - Kokerei mit - Kokserzeugung 5.600 t naß/d - Kohleeinsatz 7.800 t naß/d - Rohteer-Anfall ca. 11 t/h - Rohteerzusammensetzung - Wasser ca. 3 Gew.-% - Leichtöl 1 Gew.-% . 180 - 230 Grad C siedend 7 Gew.-% . 230 - 270 Grad C siedend 10 Gew.-% . 270 - 300 Grad C siedend 4,5 Gew.-% . 300 - 360 Grad C siedend 20 Gew.-% . Pech (EP 67 Grad C) 54,5 Gew.-% Rohteerzulauftemperatur zur Aufarbeitungsanlage ca. 55 Grad C ... Using the example of a coking plant with a coal input of 7800 t wet / d, the following quantity balance results: - coking plant with - coke production 5,600 t wet / d - Coal use 7,800 t wet / d - Attack of raw tar approx. 11 t / h - raw tar composition - Water approx. 3% by weight - light oil 1% by weight . Boiling 180 - 230 degrees C. 7% by weight . Boiling 230 - 270 degrees C. 10% by weight . Boiling 270 - 300 degrees C. 4.5% by weight . Boiling 300 - 360 degrees C. 20% by weight . Bad luck (EP 67 degrees C) 54.5% by weight Raw tar inlet temperature to the processing plant approx. 55 degrees C. ...

Im Ergebnis hat das Verfahren einen minimalen Energie­bedarf. Der minimale Energiebedarf wird insbesondere mit den gewählten Druck- und Temperaturabstufungen und der Verbundschaltung möglich.As a result, the process has minimal energy requirements. The minimum energy requirement is possible in particular with the selected pressure and temperature levels and the interconnection.

Bei dem erfindungsgemäßen Konzept fallen die Rohteer­fraktionen Leichtöl und Pech an, für die variable Weiterverarbeitungsmöglichkeiten gegeben sind.In the concept according to the invention, the crude tar fractions light oil and pitch are obtained, for which there are variable further processing options.

Im übrigen ist zu berücksichtigen, daß die Fracht­kosten für Wasser- und Pechanteile des Rohteers (ca. 57 Gew.-%) zu der zentralen Aufarbeitungsanlage entfallen; es werden die Kosten für die destillative Trennung des Rohteers in der zentralen Aufarbeitung vermindert und es entfallen die Verarbeitungskosten für Pech in der zentralen Aufarbeitungslage bzw. die Transportkosten für den Rücktransport von Pech zur Kokerei.In addition, it must be taken into account that the freight costs for water and pitch portions of the raw tar (approx. 57% by weight) to the central processing plant are eliminated; the costs for the distillative separation of the raw tar in the central processing are reduced and there are no processing costs for pitch in the central processing location or the transport costs for the return transport of pitch to the coking plant.

Claims (3)

1. Verfahren zur Aufarbeitung des beim Verkoken von Kohle anfallenden Rohteers in die Fraktionkompo­nenten bis 360 Grad C siedend und die Pechfrak­tion, dadurch gekennzeichnet, daß der Rohteer zunächst entwässert und der wasserfreie Teer anschließend in die Fraktion bis 360 Grad C, siedend, und Pech getrennt wird.1. Process for working up the raw tar obtained when coking coal in the fraction components boiling up to 360 degrees C and the pitch fraction, characterized in that the raw tar is first dewatered and the anhydrous tar is then separated into the fraction up to 360 degrees C, boiling and pitch becomes. 2. Verfahren nach Anspruch 1, gekennzeichnet durch die Zumischung der hochsiedenden Pechanteile zur Einsatzkohle der Kokerei.2. The method according to claim 1, characterized by the admixture of the high-boiling pitch components to the input coal of the coking plant. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß die Kopfprodukte und/oder die Sumpfprodukte aus der Pechkolonne zur Vorwärmung des Rohteers und/oder des Sumpfproduktes aus der Entwässerungskolonne verwendet werden.3. The method according to claim 1 or 2, characterized in that the top products and / or the bottom products from the pitch column are used for preheating the crude tar and / or the bottom product from the dewatering column.
EP89119677A 1988-12-05 1989-10-24 Process for treating coal tar Expired - Lifetime EP0372208B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3840928 1988-12-05
DE3840928A DE3840928A1 (en) 1988-12-05 1988-12-05 PROCESS FOR THE PREPARATION OF RAW STEEL

Publications (2)

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EP0372208A1 true EP0372208A1 (en) 1990-06-13
EP0372208B1 EP0372208B1 (en) 1993-02-03

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EP89119677A Expired - Lifetime EP0372208B1 (en) 1988-12-05 1989-10-24 Process for treating coal tar

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JP (1) JPH02194088A (en)
DE (2) DE3840928A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4769435B2 (en) * 2004-07-20 2011-09-07 Ｊｆｅケミカル株式会社 Synthetic tar, plugging material for molten metal outlet, and method for producing the same
CN115433602B (en) * 2022-08-31 2023-11-17 宝钢工程技术集团有限公司 Dehydration tower series heating device for tar processing and application method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB127700A (en) * 1918-05-28 1919-05-28 Thomas Owston Wilton Improvements in or relating to the Continuous Dehydration and Distillation of Tar, or other Liquids and to Apparatus therefor.
GB191295A (en) * 1922-01-27 1923-01-11 Sigurd Walfrid Albert Wikner Improvements in the distillation of tar and the like
GB200651A (en) * 1922-05-22 1923-07-19 Still Carl Improvements in and relating to apparatus for dehydrating tar
US2673833A (en) * 1951-04-03 1954-03-30 Arthur H Radasch Distillation of coal tar

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2624246C2 (en) * 1976-05-29 1986-02-20 Krupp-Koppers Gmbh, 4300 Essen Two-stage process and device for separating tar
JPS6213488A (en) * 1985-07-10 1987-01-22 Nippon Steel Chem Co Ltd Distillation of coal tar

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB127700A (en) * 1918-05-28 1919-05-28 Thomas Owston Wilton Improvements in or relating to the Continuous Dehydration and Distillation of Tar, or other Liquids and to Apparatus therefor.
GB191295A (en) * 1922-01-27 1923-01-11 Sigurd Walfrid Albert Wikner Improvements in the distillation of tar and the like
GB200651A (en) * 1922-05-22 1923-07-19 Still Carl Improvements in and relating to apparatus for dehydrating tar
US2673833A (en) * 1951-04-03 1954-03-30 Arthur H Radasch Distillation of coal tar

Also Published As

Publication number Publication date
DE3840928C2 (en) 1991-02-07
EP0372208B1 (en) 1993-02-03
DE58903456D1 (en) 1993-03-18
JPH048471B2 (en) 1992-02-17
JPH02194088A (en) 1990-07-31
DE3840928A1 (en) 1990-06-07

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